updating reference tables about comtradr HOT 4 CLOSED

This is sort of done, but we still need a function to update the reference tables for each session.

i am not sure, whether this should be a stand-alone function, like

1. ct_update_ref_tables() - In this case, all reference tables would be updated, if there has been changes.

or

2. whether it should be a parameter in ct_get_data(...,update_ref_tables = T), which would be False by default to not have unnecessary requests, but could be set to true. Then in the background, the function would only update the reference tables that it actually needs (e.g. HS, instead of downloaded all different classification schemes)

Currently I tend towards 2.

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Is now solved for now with commit 2f50898

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Should now add an option that remembers if in the current session the reference table modification was already checked, so that it only checks the reference tables once per session when update is set to TRUE.

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This is now fully implemented with 3b47b29

Not very elegant and very bulky, but it works.

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